55525561 has 16 divisors (see below), whose sum is σ = 68753664. Its totient is φ = 43665984.

The previous prime is 55525541. The next prime is 55525571. The reversal of 55525561 is 16552555.

55525561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 55525561 - 2²¹ = 53428409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55525511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13980 + ... + 17506.

It is an arithmetic number, because the mean of its divisors is an integer number (4297104).

Almost surely, 2^55525561 is an apocalyptic number.

It is an amenable number.

55525561 is a deficient number, since it is larger than the sum of its proper divisors (13228103).

55525561 is a wasteful number, since it uses less digits than its factorization.

55525561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720.

The product of its digits is 37500, while the sum is 34.

The square root of 55525561 is about 7451.5475573870. The cubic root of 55525561 is about 381.5027314324.

The spelling of 55525561 in words is "fifty-five million, five hundred twenty-five thousand, five hundred sixty-one".